Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..193m&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 1, p. 193-197.
Astronomy and Astrophysics
Astronomy
23
Radio Jets (Astronomy), Radio Sources (Astronomy), Very Large Array (Vla), X Ray Sources, Astronomical Maps, Charged Particles, Radio Emission, Rosat Mission, Synchrotron Radiation
Scientific paper
We report the identification of the radio counterpart of 1E1740.7-2942 and the detection of a double radio jet emanating from it. The jet is produced by synchrotron emission from charged particules streaming out from the high energy source. The compact radio source at the center of the double jet is time variable in flux and spectral index. We find that the changes in radio flux are correlated with the variations at hard X-rays observed by SIGMA. After September 1991 the radio flux of the compact source increased with the enhancement in hard X-ray activity. It appears that the central synchrotron source is self-absorbed during the high states of 1E1740.7-2942. Recent observations of GRS1768-258 reveal, as in 1E1740.7-2942, the presence of another triple radio source, whose central component is variable and falls inside the error circle (10 arcsec of radius) of ROSAT.
Cordier Bertand
Lebrun François
Mirabel Felix I.
Paul Jacques
Rodriguez Luis F.
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